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Alloy Steel NAS800H
Alloy Steel NAS 800H are nickel-iron-chromium alloys that provide high strength and excellent resistance to oxidation and carburization at high temperatures.
NAS 800Hoffer superior corrosion resistance in oxidizing corrosive environments such as nitric acid or nitric acid-sulfuric acid. Likewise, they perform well in sodium salt and other molten salt environments, with stress corrosion cracking resistance surpassing standard austenitic stainless steels.
Alloy Steel NAS 800H
Workability
Whether for hot working or cold working, NAS 800H/800T offer workability similar to austenitic stainless steels. For hot working, temperatures should be between 1000 and 1230℃, although light work may be done at temperatures as low as 850℃. To prevent cracks, we recommend avoiding the temperature range between 650 and 800℃. Although cold workability is similar to austenitic stainless steels, work hardening tends to be slightly lower.
Weldability
As with standard austenitic stainless steels, NAS 800H/800T may be welded using techniques such as TIG, MIG, and shield metal arc welding. AWS ERNiCr-3/AWS ENiCrFe-2 welding rods are often used.
Heat Treatment
NAS 800H/800T exhibit an austenite structure similar to austenitic stainless steels, and appropriate heat treatment procedures and requirements are similar. Typical heat treatments are as follows:
Solution treatment: 1100~1170℃; rapid cooling
For applications requiring creep rupture strength in high-temperature environments, the following ASTM B409 heat treatment may be used: Solution treatment:
1121℃ minimum (UNS N08810)
1149℃ minimum (UNS N08811)
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